Java Cache Cleanup: Clear Methods

In Java, caches can be cleared in different ways, here are some common methods:

1. Manual cleaning: Add code to the program to manually clean the cache. You can clean the data in the cache by calling the clear method of the cache object.
2. Scheduled Cleaning: Employ scheduled tasks to regularly clean the cache. You can utilize Java’s scheduled task framework, such as ScheduledExecutorService, to periodically execute the cleaning operation.
3. Based on size or time cleanup strategy: You can configure the maximum size or lifespan of the cache, and when the cache exceeds the specified size or lifespan, it will automatically be cleaned up.
4. Utilizing the Least Recently Used (LRU) algorithm: LRU algorithm eliminates the least used data based on the recently accessed order, and can be implemented using LinkedHashMap for LRU caching.
5. Weak reference cache: storing cached data using weak references allows the garbage collector to automatically clean up the data when there are no strong references to it.
6. Utilizing third-party libraries: You can use some third-party caching libraries (such as Ehcache, Guava Cache, etc.) to manage caching, these libraries typically offer rich eviction policies and tools.